Welcome to our forum.
I think before you start introducing each other to each other's friends, you need to (each) sit down with your friends *without*
the new partners present, and say, "Guys, I'm in a polyamorous relationship. I wanted to find out how you felt about that." Then be ready to answer lots of questions, since there may be a lot of questions.
You can think about new partners actually getting introduced to other partners' friends after it's establish which friends are and are not accepting about the poly thing by itself.
I would do a lot of reading on this site, to find out what has worked and what hasn't. Places to start:
Golden Nuggets board
Life stories and blogs board
Explore the various boards and threads, see what calls to you, and post your thoughts and questions as they come up.
Just take it a little at a time; you can do this.